304
13. Nile Perch Population Dynamics in Lake Victoria:
Egestion_hap[Cohorts) = IF(Fishwt[Cohorts) = 0) THEN 0
ELSE((64 .66 * (Fishwt[Cohorts] A.339))*NP_mass[Cohorts]) {egestion in joules per day}
Egestion_other[Cohorts] = IF(Fishwt[Cohorts) = 0) THEN
o ELSE((54.667 * (Fishwt[Cohorts) A. 29 ) ) *NP_ma s s [Cohor t s ) ) {egestion in joules per day}
Excretion [Cohorts) =
(Excretion_hap[Cohorts) *haps[Cohorts))+(Excret ion_other
[Cohorts)*summary[Cohorts]) {total excretion in joules}
Excretion_hap [Cohorts) = IF(Fishwt[Cohorts) = 0) THEN 0
ELSE((37.881 * (Fishwt[Cohorts) A. 339 ) ) *NP_ma s s [Cohor t s ) ) {excretion in joules per day}
Excretion_other [Cohorts) = IF(Fishwt[Cohorts) = 0) THEN
o ELSE((32 .026 * (Fishwt[Cohorts] A. 29 ) ) *NP_ma s s [Cohor t s ] ) {excretion in joules per day}
haps [Cohorts) =
hap_standing_stock /(other_standing_stock+hap_standing_s
tock+susceptible_joules[Cohorts])
haps_cons [Cohorts) =
Consumption_hap[Cohorts]*haps[Cohorts)
other [Cohorts] =
o t he r _ s t and i ng_ s t oc k / (hap_ s t a nd i ng_ s t oc k+o t he r _ s t and i ng
_stock+susceptible_joules[Cohorts])
other_cons [Cohorts] =
Consumption_other[Cohorts]*other[Cohorts]
Respiration [Cohorts] =
(Respiration_hap[Cohorts] *haps[Cohorts])+(Respiration_0
ther[Cohorts]*summary[Cohorts]) {active respiration
plus standard respiration in joules}
Respiration_hap [Cohorts] = IF(Fishwt[Cohorts) = 0) THEN
o ELSE((58.133 * (Fishwt[Cohorts) A. 2 ) )* NP_ma s s [Cohor t s ] ) {respiration in joules per day}
Respiration_other [Cohorts) = IF(Fishwt[Cohorts] = 0)
THEN 0 ELSE((116.265 * (Fishwt[Cohorts] A.2))*NP_mass[Cohorts)) {respiration in joules per day}
SDA[Cohorts] =
(SDA_hap[Cohorts]*haps[Cohorts))+(SDA_other[Cohorts]*su
mmary[Cohorts)) {total Specific Dynamic Action in
joules}
SDA_hap[Cohorts] = IF(Fishwt[Cohorts] = 0) THEN 0
ELSE((90.802 * (Fishwt[Cohorts] A.339))*NP_mass[Cohorts]) {SDA in joules per day}